A new ComRes poll for ITV now provides evidence to the contrary.
Based on a poll of 26,000 people ComRes concluded;
More people’s preferred outcome is now for the UK to leave the European Union (50% v 42% remain).
However, when the “don’t knows” (of those expressing an opinion) are excluded, over half say their preferred outcome is for the UK to leave the EU (54%) compared to less than half who say their preferred outcome is for the UK to remain in the EU (46%)
ComRes surveyed 26,000 British adults on 2nd – 14th October 2019. Data were weighted to be demographically representative of all GB adults.
There's no indication on the ComRes page why this poll is out of step with those over the last two years. The major change is obviously that this poll comes after Johnson took over as PM.